CPAP Inline Filter for ResMed & DreamStation Machines — 22mm & 25mm Compatible This inline CPAP filter is designed for most standard CPAP and BiPAP machines, including ResMed AirSense 11, ResMed AirSense 10, DreamStation, and other popular models. It fits 22mm CPAP tubing and 25mm mask elbows, delivering clean, filtered air while helping extend the service life of your device. Key Benefits & Features Protects Your CPAP Machine: Reduces dust and debris buildup inside your